package models

import (
	"errors"
	"fmt"
	"math"
	"reflect"
	"strings"

	"github.com/astaxie/beego/orm"
)

type Goods struct {
	Id         int     `orm:"column(id);auto"`                      //
	Name       string  `orm:"column(name);size(255)"`               //商品名字
	Spec       string  `orm:"column(spec);size(255)"`               //规格
	Gmodel     string  `orm:"column(gmodel);size(255)"`             //型号
	SorteId    int     `orm:"column(sorte_id)"`                     //分类
	Status     int     `orm:"column(status)"`                       //状态（0 有效 1无效）
	SaleStatus int     `orm:"column(sale_status)"`                  //销售状态（0 可销售 1不可销售
	Price      float64 `orm:"column(price);digits(10);decimals(2)"` //销售价格
	Gcode      string  `orm:"column(gcode);size(255)"`              //产品编码
	Units      string  `orm:"column(units);size(30)"`               //产品单位
	Ctime      int     `orm:"column(ctime)"`                        //创建时间
	Cuid       int     `orm:"column(cuid)"`                         //创建者
}

type Goodss struct {
	Id         int     `orm:"column(id);auto"`                      //
	Name       string  `orm:"column(name);size(255)"`               //商品名字
	Spec       string  `orm:"column(spec);size(255)"`               //规格
	Gmodel     string  `orm:"column(gmodel);size(255)"`             //型号
	SorteId    int     `orm:"column(sorte_id)"`                     //分类
	Status     int     `orm:"column(status)"`                       //状态（0 有效 1无效）
	SaleStatus int     `orm:"column(sale_status)"`                  //销售状态（0 可销售 1不可销售
	Price      float64 `orm:"column(price);digits(10);decimals(2)"` //销售价格
	Gcode      string  `orm:"column(gcode);size(255)"`              //产品编码
	Units      string  `orm:"column(units);size(30)"`               //产品单位
	Ctime      int64   `orm:"column(ctime)"`                        //创建时间
	Cuid       int     `orm:"column(cuid)"`                         //创建者
	Sname      string  `orm:"column(sname)"`                        //分类名字

}

func (t *Goods) TableName() string {
	return "my_goods"
}

func init() {
	orm.RegisterModel(new(Goods))
}

// AddGoods insert a new Goods into database and returns
// last inserted Id on success.
func AddGoods(m *Goods) (id int64, err error) {
	o := orm.NewOrm()
	id, err = o.Insert(m)
	return
}

// GetGoodsById retrieves Goods by Id. Returns error if
// Id doesn't exist
func GetGoodsById(id int) (v *Goods, err error) {
	o := orm.NewOrm()
	v = &Goods{Id: id}
	if err = o.Read(v); err == nil {
		return v, nil
	}
	return nil, err
}

//获取产品列表
func GetGoodsList(page int64, page_size int64, where string) (count int64, l []Goodss) {

	o := orm.NewOrm()
	count, err := o.QueryTable(new(Goods)).Count()
	if err != nil {
		return
	}
	var offset int64
	if page <= 1 {
		offset = 0
	} else {
		offset = (page - 1) * page_size
	}
	if page*page_size > count {
		if page_size > count {
			offset = 0
		} else {
			s := math.Floor(float64(count)/float64(page_size)) * float64(page_size)
			offset = int64(s)
		}
	}

	qb, _ := orm.NewQueryBuilder("mysql")
	qb = qb.Select("my_goods.*", "my_sorts.name as sname").From("my_goods").
		LeftJoin("my_sorts").On("my_goods.sorte_id=my_sorts.id")
	if where != "" {
		qb = qb.Where(where)
	}
	qb = qb.Limit(int(page_size)).Offset(int(offset))
	sql := qb.String()
	_, err = o.Raw(sql).QueryRows(&l)
	fmt.Println(err)
	return

}

// GetAllGoods retrieves all Goods matches certain condition. Returns empty list if
// no records exist
func GetAllGoods(query map[string]string, fields []string, sortby []string, order []string,
	offset int64, limit int64) (ml []interface{}, err error) {
	o := orm.NewOrm()
	qs := o.QueryTable(new(Goods))
	// query k=v
	for k, v := range query {
		// rewrite dot-notation to Object__Attribute
		k = strings.Replace(k, ".", "__", -1)
		if strings.Contains(k, "isnull") {
			qs = qs.Filter(k, (v == "true" || v == "1"))
		} else {
			qs = qs.Filter(k, v)
		}
	}
	// order by:
	var sortFields []string
	if len(sortby) != 0 {
		if len(sortby) == len(order) {
			// 1) for each sort field, there is an associated order
			for i, v := range sortby {
				orderby := ""
				if order[i] == "desc" {
					orderby = "-" + v
				} else if order[i] == "asc" {
					orderby = v
				} else {
					return nil, errors.New("Error: Invalid order. Must be either [asc|desc]")
				}
				sortFields = append(sortFields, orderby)
			}
			qs = qs.OrderBy(sortFields...)
		} else if len(sortby) != len(order) && len(order) == 1 {
			// 2) there is exactly one order, all the sorted fields will be sorted by this order
			for _, v := range sortby {
				orderby := ""
				if order[0] == "desc" {
					orderby = "-" + v
				} else if order[0] == "asc" {
					orderby = v
				} else {
					return nil, errors.New("Error: Invalid order. Must be either [asc|desc]")
				}
				sortFields = append(sortFields, orderby)
			}
		} else if len(sortby) != len(order) && len(order) != 1 {
			return nil, errors.New("Error: 'sortby', 'order' sizes mismatch or 'order' size is not 1")
		}
	} else {
		if len(order) != 0 {
			return nil, errors.New("Error: unused 'order' fields")
		}
	}

	var l []Goods
	qs = qs.OrderBy(sortFields...)
	if _, err = qs.Limit(limit, offset).All(&l, fields...); err == nil {
		if len(fields) == 0 {
			for _, v := range l {
				ml = append(ml, v)
			}
		} else {
			// trim unused fields
			for _, v := range l {
				m := make(map[string]interface{})
				val := reflect.ValueOf(v)
				for _, fname := range fields {
					m[fname] = val.FieldByName(fname).Interface()
				}
				ml = append(ml, m)
			}
		}
		return ml, nil
	}
	return nil, err
}

// UpdateGoods updates Goods by Id and returns error if
// the record to be updated doesn't exist
func UpdateGoodsById(m *Goods) (err error) {
	o := orm.NewOrm()
	v := Goods{Id: m.Id}
	// ascertain id exists in the database
	if err = o.Read(&v); err == nil {
		var num int64
		if num, err = o.Update(m); err == nil {
			fmt.Println("Number of records updated in database:", num)
		}
	}
	return
}

// DeleteGoods deletes Goods by Id and returns error if
// the record to be deleted doesn't exist
func DeleteGoods(id int) (err error) {
	o := orm.NewOrm()
	v := Goods{Id: id}
	// ascertain id exists in the database
	if err = o.Read(&v); err == nil {
		var num int64
		if num, err = o.Delete(&Goods{Id: id}); err == nil {
			fmt.Println("Number of records deleted in database:", num)
		}
	}
	return
}
